Automatic train-stop.



H. G. SEDGWIGK.

AUTOMATIC TRAIN STOR' APPLIOATIQN FILED DEC. 24', 1908. RENEWED AP 25, 1912.

1,082,825, Patented Dec. 30,1913.

I [-4 Z 2 n r tro? l n Fvvvrv lul loll till. .ll 4 ill HIFEULM SEDGWICK, MILL VALLEY, CALIEQRNIA, ASSIGNOl-l', TO THE NATIONAL SAFETY APPLIANCE COMPANY, A COBEDRATION OF OALIFORNIL Specifiescion of EetterePatent.

Patented Dec. 363

Applicationfilcd December fill, with, filerinl llo. 48%,09r8. Renewed Atari] 25, 1913. Serial No. 763,665.

T'aaZl whom, it may concm:

Be it known that I, Eileen G. Snoowioir, a citizen'of the United States oft America, and a resident of Mill Valley, county of Marin, State of Celifornie, hove invented certain new and useful Improvements in A11- toinntic Train-Stops, of which the following is a. full and clear specification, reference heizig had to the occoinpnnying drawings, in Which-'- Figure 1 is a view partly in section and partly in side elevation showing my invention applied to c locomotive; and, Fig. 2 1s a detail vertical section of one form of ventvnlve mechanism,

ll/ly invention has relationto that type of automatic trniivstops covered by my copending appli ution, Serial No. looms, filed October 24, 1908.

When the locomotive is running tandem, that is, behind one or more preceding loco= motives in the some train, it is the rule-tor the rear locomotives to out out their broke controlling 'ineans completely, so that the lending locomotive will have sole control oi the brake mechanism of the train.

The object of the present invention is to. provide means whereby when the engineer cuts out his brake mechanism he will by the some act break or open the operating circuit controlled by the roadbed devices whereby this circuit will be rendered inoperative even though the locomotive pass over roodhed devices set to danger, the device being espe cially adopted for the nornmlly closed circhurned no my cuit mechanism shown and aforesaid application. Referring to the drawings annexed by erence characters the letter a designates the train-pipe of the usual sir-hm mechanism; Z the usual storage reservoir; 0 the usual pipe leading from said reservoir to the engineers valve (5 and thence to the train-pipe, by which the supply of air to the train-pipe is kept at normal pressure; e is n pipe connecting the train-pipe to the engineers valve through which pipe (2 the train-pipe is vented, the air escaping through a port j in the valve in the usual nnlnncr; g is o douhle cut-oil in pipes e and 0, at :1. point below the valve (2, by means or"- which sa d valve {1 may cut oil from the niche a mrotns and rendered incapable of affectingthe mechcnisn All the above arts ore constructed in the usual manner.

diced or its cvl that when the engineers valve is cutout the vent-valve mechanism will also he cut out but with my present lnvention'the pipe may be connected directly to the trunvpigw o if it he desired to do so.

The vent-valve mechunisnrshownconsisis of :1. main valve it. grovitutingiv sliding in a vertical cylinder j and nornnilly closing thc vent 7c in the side of said cylinder. "lhe vent-pipe 2' enters this cylinder at a point below the vent 11: and communicates with a port Z in the side of the main valve. To insure the valve 71 against stickin in its cylinder I prefer employing a spring or normally forcing said valve downwardly. From the side of the cylinder 9' at a point below the normal position of the valve i1 is a port it which leads into the cylinder 0 of n pilotwolvc p which valve is normally pressed upwardly by c spring 57 to norinzilly close port to and also normally close an inlet pipe 0' connect ing sold cylinder 0 to the pipe (7 leading from the storage reservoir. The valve p is'provided with a circ mferential port r and vi ith e. stem 3 -1 l out through the upper r Mounted ohove toe pilot-vclve is a pair of z?" "rhich are included in o. normallyclosed circuit 14 are kept normally ener gized. These normally energized magnets. normally hold up a drop-Weight- 2: directly over the stem 8 of the pilot-valve, the opposite ln'nnches of this normollW-close circuit are connected to the respective branches to of the norn'iiill v-open operating circuit connected to the current collectors which in this instance are the axle and a brush on At a point-adjacent to the cut-oil valve 9 one of the branches to is broken and provided With contact terminalswhich are adapted to be connected or bridged hy means of a contact e oy cut-off vnlve 7 when the 'volve is opened.

It Wih be observed that when the normally-closed circuit u is weakened by the closing of the circuit 'w by the roadbed devices the magnets 25 Will be sufficiently deenergized to drop the weight 1). The dropping of the weight 4) on the stem 3 forces down the pilot-valve until its port 7 registers with the inlet port 0 and the port n, whereupon air from the reservoir 7) will be let in under the main valve 72, to lift the same iar enough to bring its port Z into communication with the vent po t is, thus venting the train-pipe and applying the brakes. When the cut-off valve 9 is operated to cut out the controlling-valve (Z the bridging piece 2 A will be disconnected from one of the contactplates 3 and thus render partial circuit a inoperative c; 11 though its terminals make connection with stopping devices set to dangel. This is advantageous in that otherwise where a locomotive is running behind another its vent-valve would be operated without the engineer being aware of the fact, which would be dangerous in that after the locomotive is disconnected from thattrain the automaticstopping devices might be in an inoperative condition without the engineer being made aware of that fact.

It is obvious that this improvement may be employed in connection with other forms crating circuit connected to said closed circuit, this normally-open circuit havmg a pair of separated contact-plates in one branch, a movable bridge-piece for connecting these contact-plates, this bridge-piece being shifted to break the circuit by the closing of the cut-off valve in the brake mechanism.

)2 In an automatic train-stop, a train-pipe system embodying a cut-cit valve for, ren

'dering the controller-valve inoperative, a

vent-valve and clectro-magnetic devices for opening the same embodying a normallyclosed circuit, an operating circuit connected to the normally-closed circuit and having its terminals connected to current-collecting or contact devices and having a break in one of its branches, and means operated by the aforesaid cut-oft valve to close and open said brake, for the purpose set forth.

3. In an automatic train stop, a train'pipe system embodying a cut-oil valve for rendering the controller valve inoperative, a vent valve and electro magnetic devices for controlling the same, andmeans operated by said cut-off valve to render theele ctronna'g-" netie devices inoperative. 4-. In an automatic train stop, an air brake system embodying a cut off valve for rendering; the engineers valve inoperative, an en'iergency vent valve for applying the brakes and auton'latic means for opening said vent valve, and devices operated by the closing t said cut oil valve to render the vent valve operating means inoperative, for the purpose set forth.

In testimony whereof I hereunto afiix my signature in the presence of two Witnesses this 10th day of December, 1908.

HIE-AM G. SEDGWIOK.

lVitnesses Ci-IAs. H. HUNTOON, F. G. ANKERS. 

